Technology Study On Rise Type Steel Structure On Built Framework Bridgein Mining Subsidence Area

This paper takes built framework bridge in mining subsidence area as the research background, designing a rise type steel structure as a built frame bridge of adding structure. Design of steel structure members through theoretical calculation and numerical simulation. With ANSYS numerical simulation as the basic means, analyzes the design structure affected by mining subsidence influence of static response, dynamic characteristics and stability, and for the stability of steel structure optimization is proposed.The main results are as follows:(1) Design meet built frame bridge in mining subsidence area is rise type steel structure, make the frame bridge adding layers of temporary structure and permanent structure together.(2) Steel structure slope constant, different inclination, with the steel platform rising, sinking column in steel structure with side force reduction, sink side steel structure column stress increase; the main beams are reduced.(3) Steel platform rising height is unchanged, different inclination, with steel structure slope increased, sink side of steel structure column axial force decreases linearly, not sink side column axial force increases linearly; internal force of girder are linear increase.(4) Secondary beam is less affected by mining subsidence, the stress state of little change.(5) Rise type steel structure affected by mining subsidence the self vibration frequency was varied in the range between the 4.98Hz~21.29 Hz were greater than the train vibration frequency; steel structure rising 3.6m when the dynamic characteristics of the optimal.(6) Steel platform rised 6m, slope more than 40‰, shall be of steel structure reinforced concrete columns.(7) Reinforced with diagonal bracing for steel structure columns. The stability of the steel structure is significantly improved. The first order buckling load increases and the first-order buckling maximum deformation decreases.